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Double-phase steel plate and manufacturing method thereof

A steel plate, mass percentage technology, applied in the field of dual-phase steel plate and its manufacturing, can solve the problem of not taking into account the balance of carbon equivalent, drawing performance and hole expansion rate, unfavorable weldability, surface quality and phosphating Performance, failure to take into account the surface and phosphating performance, etc., to achieve good uniformity of mechanical properties, achieve performance balance, and facilitate welding effects

Active Publication Date: 2012-07-18
BAOSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0010] The above patents involving 980Mpa dual-phase steel, although some involve higher hole expansion rate, all adopt high carbon content and high Si content, which is not conducive to weldability, surface quality and phosphating performance
In addition, some high-Si steels have a high hole expansion rate, but the yield ratio is high, and the stamping performance decreases
Although it has advantages in the manufacture of parts with higher single requirements for hole expansion rate, it cannot adapt to the manufacture of parts with higher requirements for drawing and hole expansion, and most of the safety structural parts of automobile bodies belong to this category
The design of the above-mentioned invention failed to take into account the balance of carbon equivalent, drawing performance and hole expansion rate, and also failed to take into account good surface and phosphating performance

Method used

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  • Double-phase steel plate and manufacturing method thereof
  • Double-phase steel plate and manufacturing method thereof
  • Double-phase steel plate and manufacturing method thereof

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Embodiment Construction

[0039] According to the present invention, the chemical composition mass percentage of the dual-phase steel sheet is:

[0040] C: 0.07~0.098; Si: 0.1~0.4;

[0041] Mn: 1.95~2.2; Cr: 0.3~0.6;

[0042] P: ≤0.015; S: ≤0.004;

[0043] N:≤0.005; Nb: 0.015~0.04;

[0044] Ti: 0.015~0.04; Al: 0.015~0.045;

[0045] Also contains B: 0.002 to 0.004 or Mo: 0.2 to 0.4;

[0046] Others are Fe and inevitable impurities,

[0047] Wherein, the mass percentage of the chemical composition of the dual-phase steel sheet satisfies:

[0048] Pcm=C+Si / 30+Mn / 20+2P+4S)≤0.24.

[0049] The effect of each main chemical component element in the dual-phase steel sheet of the present invention is as follows:

[0050] C: Improve the strength of martensite, affect the content of martensite, and have a great influence on the strength. The increase of carbon content is not good for weldability. Therefore, the carbon content should be selected between 0.07% and 0.098%. If it is lower than 0.07%, the stren...

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Abstract

The invention provides a double-phase steel plate which comprises 0.07-0.098 of C, 0.1-0.4 of Si, 1.95-2.2 of Mn, 0.3-0.6 of Cr, less than or equal to 0.015 of P, less than or equal to 0.004 of S, less than or equal to 0.005 of N, 0.015-0.04 of Nb, 0.015-0.04 of Ti, 0.015-0.045 of Al, and 0.002-0.004 of B or 0.2-0.4 or Mo, wherein Pcm equals to C+Si / 30+Mn / 20+2P+4S which is less than or equals to 0.24; and the double-phase steel plate also comprises the balance of Fe and unavoidable impurities. The invention also provides a manufacturing method of the double-phase steel plate. The high-strength uniform-performance double-phase steel plate can be obtained by the proper composition design and manufacturing technology, and the manufacturing requirements on parts of a high-strength automobile body can be better met.

Description

technical field [0001] The invention relates to a dual-phase steel sheet and a manufacturing method thereof, in particular to a performance-balanced cold-rolled 980MPa dual-phase steel sheet and a manufacturing method thereof. Performance-balanced dual-phase steel refers to cold-rolled high-strength dual-phase strip with low carbon equivalent, higher elongation and hole expansion ratio. Background technique [0002] In order to reduce weight, the automobile industry requires the use of higher-strength steel plates. Among them, ultra-high-strength dual-phase steel with a tensile strength of 980Mpa and above has increasingly become the first choice for the automobile manufacturing industry, because this kind of strength steel can effectively reduce the weight of the automobile body and improve the safety. In the process of automobile manufacturing, high-strength steel plates not only require good elongation, but also require high local formability, that is, high hole expansio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/02
Inventor 朱晓东李旭飞
Owner BAOSHAN IRON & STEEL CO LTD
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